US20080054052A1 - Method of manufacturing semiconductor device - Google Patents

Method of manufacturing semiconductor device Download PDF

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Publication number
US20080054052A1
US20080054052A1 US11/833,643 US83364307A US2008054052A1 US 20080054052 A1 US20080054052 A1 US 20080054052A1 US 83364307 A US83364307 A US 83364307A US 2008054052 A1 US2008054052 A1 US 2008054052A1
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United States
Prior art keywords
capillary
wire
bump electrode
semiconductor device
pad
Prior art date
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Abandoned
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US11/833,643
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English (en)
Inventor
Hideyuki Arakawa
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Renesas Technology Corp
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Renesas Technology Corp
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Assigned to RENESAS TECHNOLOGY CORP. reassignment RENESAS TECHNOLOGY CORP. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ARAKAWA, HIDEYUKI
Publication of US20080054052A1 publication Critical patent/US20080054052A1/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/002—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating specially adapted for particular articles or work
    • B23K20/004—Wire welding
    • B23K20/005—Capillary welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/10—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating making use of vibrations, e.g. ultrasonic welding
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Definitions

  • the present invention relates to a manufacturing method of a semiconductor device which forms a bump electrode on a pad with the wire which passed to the capillary, and especially relates to a manufacturing method of a semiconductor device which can make the cut of the wire from a bump electrode easy, and can obtain a suitable-shaped bump electrode.
  • a bump electrode is used for wire bonding of a chip to chip (chip-to-chip).
  • reverse bonding which used the bump electrode is performed. This bump electrode is formed on a pad with the wire which was passed to the capillary (for example, refer to Patent References 1-3).
  • Patent Reference 1 Japanese Unexamined Patent Publication No. Hei 5-235002
  • Patent Reference 3 Japanese Unexamined Patent Publication No. 2000-106381
  • the gold wire was cut by crushing a gold wire by a capillary, thinning and conventionally, pulling on both sides of a gold wire by a clamper, after forming a bump electrode.
  • the bump electrode was soft, it became insufficient to crush of a gold wire and was not fully able to thin a gold wire.
  • the strength of the gold wire became high, the distortion of the gold wire by the reaction at the time of cutting a gold wire, and the peeling from Al pad of a bump electrode had occurred. That is, there was a problem that a wire could not be cut easily.
  • Patent Reference 2 when moving a capillary to a horizontal direction, the wire was cut. Therefore, the complicated step was required in order to pull out the wire for forming the following bump electrode from a capillary. That is, there was a problem that a wire could not be easily pulled out from a capillary.
  • Patent Reference 3 there is disclosure about the step which dwindles the neck part of a wire by doing horizontal displacement after a capillary is raised to near the root of a gold wire when a gold ball deforms plastically in the case of bonding, in the state which entered the inside of the through hole of a capillary.
  • Patent Reference 3 although it is moving only the distance exceeding 2 ⁇ 3 of the diameter of a gold wire about the amount of horizontal displacement of a capillary, when the movement magnitude of a capillary is unsuitable, bump form may not be stabilized but it may become the form where a part of wires remained on the bump.
  • the present invention is made in order to solve the above problems.
  • a purpose is to obtain the manufacturing method of the semiconductor device which can cut a wire easily, can obtain a suitable-shaped bump electrode, and can pull out a wire easily from a capillary.
  • a method of manufacturing a semiconductor device concerning this invention comprises the steps of forming a bump electrode on a pad with a wire which is passed to a capillary after a portion has eaten away in the capillary, raising the capillary only 30 ⁇ m ⁇ 45 ⁇ m, dwindling the wire making the capillary move only 35 ⁇ m ⁇ 55 ⁇ m to a horizontal direction after raising the capillary, raising the capillary and pulls out the wire from the capillary after dwindling the wire, and cutting the wire by pulling upward on both sides of the wire by a clamper after pulling out the wire from the capillary.
  • a wire can be cut easily, a suitable-shaped bump electrode can be obtained, and a wire can be easily pulled out from a capillary.
  • FIG. 1 is a cross-sectional view showing an example of the semiconductor device manufactured by the manufacturing method concerning Embodiment 1 of the present invention
  • FIG. 2 is a top view showing an example of the semiconductor device manufactured by the manufacturing method concerning Embodiment 1 of the present invention
  • FIG. 3 is a side view for explaining the manufacturing method of the semiconductor device concerning Embodiment 1 of the present invention.
  • FIG. 4 is the plan view which observed the state of FIG. 3 from the upper part
  • FIG. 5 is a side view for explaining the manufacturing method of the semiconductor device concerning Embodiment 1 of the present invention.
  • FIG. 6 is the plan view which observed the state of FIG. 5 from the upper part
  • FIGS. 7 and 8 are side views for explaining the manufacturing method of the semiconductor device concerning Embodiment 1 of the present invention.
  • FIG. 9 is the plan view which observed the state of FIG. 8 from the upper part
  • FIG. 10 is a side view for explaining the manufacturing method of the semiconductor device concerning Embodiment 1 of the present invention.
  • FIG. 11 is the plan view which observed the state of FIG. 10 from the upper part;
  • FIG. 12 is a drawing showing the experimental result which examined the form of the bump electrode according to the ascending amount and the amount of transverse movements of a capillary;
  • FIGS. 13 to 16 are side views for explaining the manufacturing method of the semiconductor device concerning Embodiment 1 of the present invention.
  • FIGS. 17 to 19 are side views for explaining the manufacturing method of the semiconductor device concerning Embodiment 2 of the present invention.
  • FIG. 1 is a cross-sectional view showing an example of the semiconductor device manufactured by the manufacturing method concerning Embodiment 1 of the present invention
  • FIG. 2 is the top view.
  • chip 12 On glass epoxy wiring substrate 11 , chip 12 , spacer chip 13 , chip 14 , and chip 15 are loaded.
  • Bump electrode 17 is formed on aluminum pad 16 of chips 12 , 14 , and 15 .
  • ball bonding of the gold wire 18 is done to pad 19 , and stitch bonding is done on bump electrode 17 .
  • the whole is sealed with sealing resin 20 and solder ball 21 is formed in the bottom of glass epoxy wiring substrate 11 .
  • gold ball 24 with a larger diameter than gold wire 18 is formed by melting the tip of gold wire 18 which passed to capillary 22 by electric discharge from a torch (un-illustrating).
  • the diameter of gold wire 18 is 25 ⁇ m
  • the diameter of gold ball 24 is 56 ⁇ m.
  • the form of the capillary in FIG. 4 is drawn as a part for the projection part of the tip surface of a capillary. That is, an inside circle shows the position of the inner wall of the through hole of a capillary, and the diameter is 42 ⁇ m in this embodiment.
  • the boundary of the tip surface of a capillary and a side surface is formed by the curved surface as shown in FIG. 3 or FIG. 5 .
  • the surface which makes the angle of 45 or less degrees is a tip surface of a capillary, and defines it as the surface which makes the angle of 45 degrees or more being the side surface or through hole inner wall of a capillary.
  • the diameter of the tip surface of a capillary is 125 ⁇ m.
  • the interface of aluminum pad 16 is joined to gold ball 24 by pushing and pressing gold ball 24 on aluminum pad 16 of chip 15 , and applying 30 g of loads, heat, an ultrasonic wave, etc. by capillary 22 .
  • this state is seen from the upper part, it will become like FIG. 6 .
  • this forms bump electrode 17 after the portion has eaten away in capillary 22 .
  • the height of the portion which ate away in capillary 22 of bump electrode 17 is 35 ⁇ 5 ⁇ m, and the width is the same 42 ⁇ m as the inside diameter of a capillary through hole.
  • the height of the portion out of capillary 22 of bump electrode 17 is 10 ⁇ m, and the width is 70 ⁇ m.
  • the width of the taper part at capillary 22 tip is 56 ⁇ m.
  • capillary 22 is raised only by 30 ⁇ m ⁇ 45 ⁇ m.
  • the tip of capillary 22 comes to the height of ⁇ 5 ⁇ m ⁇ 10 ⁇ m to the boundary line of bump electrode 17 and gold wire 18 .
  • capillary 22 is moved 35 ⁇ m ⁇ 55 ⁇ m, for example, 45 ⁇ m, to a horizontal direction, and gold wire 18 is dwindled.
  • the inner wall of capillary 22 will come to the position of the outer wall of gold wire 18 which is in the opposite side with the inner wall of capillary 22 .
  • FIG. 9 When this state is seen from the upper part, it will become like FIG. 9 .
  • the junction portions of gold wire 18 and bump electrode 17 are located directly under a capillary 22 tip surface.
  • capillary 22 is moved so that the whole surface of the junction portion of gold wire 18 and bump electrode 17 may be located directly under a capillary 22 tip surface on a plan view.
  • a part of gold wires 18 can be made thin enough, and the form of bump electrode 17 after gold wire 18 cutting can be stabilized.
  • capillary 22 is moved only 55 ⁇ m to a horizontal direction, as shown in FIG. 10 , a horizontal distance of the inner wall of capillary 22 and the junction portion of gold wire 18 and bump electrode 17 will become large.
  • FIG. 12 is a drawing showing the experimental result which examined the form of the bump electrode according to the ascending amount and the amount of transverse movements of a capillary.
  • This result shows that a suitable-shaped bump electrode can be obtained when the ascending amount of a capillary is 30 ⁇ m ⁇ 45 ⁇ m and the amount of transverse movements is 35 ⁇ m ⁇ 55 ⁇ m. That is, a certain amount of height can be secured and a suitable-shaped bump electrode can be obtained without a projection's remaining in a bump electrode, even when forming a bump electrode, after the portion has eaten away in a capillary.
  • gold wire 18 is pulled out from capillary 22 by raising capillary 22 , where bump electrode 17 is connected with gold wire 18 .
  • gold wire 18 for forming the following bump electrode can be easily pulled out from capillary 22 .
  • gold wire 18 is cut on bump electrode 17 by pulling upward on both sides of gold wire 18 above capillary 22 by clamper 25 .
  • gold wire 18 is dwindled by a rise and transverse movement of capillary 22 as mentioned above, gold wire 18 can be cut easily.
  • gold ball 24 is formed at the tip of gold wire 18 discharged from capillary 22 like FIG. 3 .
  • ball bonding of the gold ball 24 at the tip of gold wire 18 is done to pad 19 of glass epoxy wiring substrate 11 using capillary 22 .
  • gold wire 18 prolonged from gold ball 24 is discharged from capillary 22 , and it lengthens on bump electrode 17 .
  • Stitch bonding of a part of gold wires 18 prolonged from gold ball 24 is done on bump electrode 17 , pushing and pressing gold wire 18 for 10 ms to bump electrode 17 by capillary 22 , and applying supersonic vibration.
  • gold wire 18 is cut by pulling upward on both sides of gold wire 18 by clamper 25 .
  • pad 19 of glass epoxy wiring substrate 11 is electrically connected with bump electrode 17 with gold wire 18 discharged from capillary 22 .
  • the semiconductor device shown in FIG. 1 is manufactured through the usual manufacturing process.
  • the load of capillary 22 to aluminum pad 16 shall be 5 g or less.
  • the tip of capillary 22 has touched bump electrode 17 as it is, it maintains 5 ms or more.
  • the length for an over hang of chip 14 is 1.2 mm and the thickness of chip 14 is 90 ⁇ m, the length for an over hang of chip 14 is 10 or more times of the thickness of chip 14 . In this case, the above-mentioned state is maintained 16 ms or more preferably at least 10 ms or more.
  • Chip 14 which had bent below goes up according to the above-mentioned step, and as shown in FIG. 19 , bending of chip 14 is canceled.
  • capillary 22 is raised only 30 ⁇ m ⁇ 45 ⁇ m.
  • Other steps are the same as that of Embodiment 1.
  • Embodiment 1 even when forming a bump electrode in a part for the over hang of a chip, a certain amount of height can be secured and a suitable-shaped bump electrode can be obtained without a projection's remaining in a bump electrode.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Computer Hardware Design (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Wire Bonding (AREA)
US11/833,643 2006-09-04 2007-08-03 Method of manufacturing semiconductor device Abandoned US20080054052A1 (en)

Applications Claiming Priority (2)

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JP2006-239252 2006-09-04
JP2006239252A JP2008066331A (ja) 2006-09-04 2006-09-04 半導体装置の製造方法

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